Improve the Unsubscribe confirmation page

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/views/sent_notifications/unsubscribe.html.haml

 - noteable = @sent_notification.noteable
 - noteable_type = @sent_notification.noteable_type.humanize(capitalize: false)
-- noteable_text = %(#{noteable_type} "#{noteable.title}" (#{noteable.to_reference}))
-- title = "Unsubscribe from #{noteable_text}"
+- noteable_text = %(#{noteable.title} (#{noteable.to_reference}))
 
-- page_title title
+- page_title "Unsubscribe", noteable_text, @sent_notification.noteable_type.humanize.pluralize, @sent_notification.project.name_with_namespace
 
-%h3.page-title= title
 
-%p= "Are you sure you want to unsubscribe from #{noteable_text}?"
+%h3.page-title
+  Unsubscribe from #{noteable_type} #{noteable_text}
+
+%p
+  = succeed '?' do
+    Are you sure you want to unsubscribe from #{noteable_type}
+    = link_to noteable_text, url_for([@sent_notification.project.namespace.becomes(Namespace), @sent_notification.project, noteable])
 
 %p
   = link_to 'Unsubscribe', unsubscribe_sent_notification_path(@sent_notification, force: true),

spec/features/unsubscribe_links_spec.rb

@@ -24,8 +24,8 @@ describe 'Unsubscribe links', feature: true do
         visit body_link
 
         expect(current_path).to eq unsubscribe_sent_notification_path(SentNotification.last)
-        expect(page).to have_text(%(Unsubscribe from issue "#{issue.title}" (#{issue.to_reference})))
-        expect(page).to have_text(%(Are you sure you want to unsubscribe from issue "#{issue.title}" (#{issue.to_reference})?))
+        expect(page).to have_text(%(Unsubscribe from issue #{issue.title} (#{issue.to_reference})))
+        expect(page).to have_text(%(Are you sure you want to unsubscribe from issue #{issue.title} (#{issue.to_reference})?))
         expect(issue.subscribed?(recipient)).to be_truthy
 
         click_link 'Unsubscribe'